Android Open Source - android-davsync Settings Activity

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License

The source code is released under:

Copyright ? 2013, Michael Stapelberg and contributors All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following ...

Java Source Code

package net.zekjur.davsync;
/* w ww. j  av a  2 s.c  o  m*/
import java.util.List;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceCategory;
import android.preference.PreferenceFragment;

// XXX: I am aware of the fact that the EditTextPreferences dont display a
// meaningful summary. This seems to be possible, see
// http://stackoverflow.com/questions/531427/how-do-i-display-the-current-value-of-an-android-preference-in-the-preference-su
// However, I think it is overly complicated and Im not motivated to test
// this app on a tablet. Patches welcome.

/**
 * A {@link PreferenceActivity} that presents a set of application settings. On
 * handset devices, settings are presented as a single list. On tablets,
 * settings are split by category, with category headers shown to the left of
 * the list of settings.
 * <p>
 * See <a href="http://developer.android.com/design/patterns/settings.html">
 * Android Design: Settings</a> for design guidelines and the <a
 * href="http://developer.android.com/guide/topics/ui/settings.html">Settings
 * API Guide</a> for more information on developing a Settings UI.
 */
public class SettingsActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener {
  /**
   * Determines whether to always show the simplified settings UI, where
   * settings are presented in a single list. When false, settings are shown
   * as a master/detail two-pane view on tablets. When true, a single pane is
   * shown on tablets.
   */
  private static final boolean ALWAYS_SIMPLE_PREFS = false;
  
  private EditTextPreference webdavUrlPreference;
  private EditTextPreference webdavUserPreference;
  private EditTextPreference webdavPwdPreference;

  @Override
  protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);

    setupSimplePreferencesScreen();
    
    webdavUrlPreference = (EditTextPreference) getPreferenceScreen().findPreference("webdav_url");
    webdavUserPreference = (EditTextPreference) getPreferenceScreen().findPreference("webdav_user");
    webdavPwdPreference = (EditTextPreference) getPreferenceScreen().findPreference("webdav_password");
  }

  @Override
  protected void onPause() {
    super.onPause();
    
    getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
  }

  @Override
  protected void onResume() {
    super.onResume();
    
    SharedPreferences sharedPreferences = getPreferenceScreen().getSharedPreferences();
    webdavUrlPreference.setSummary(sharedPreferences.getString("webdav_url", ""));
    webdavUserPreference.setSummary(sharedPreferences.getString("webdav_user", ""));
    if (sharedPreferences.getString("webdav_password", "").equals("")) {
      webdavPwdPreference.setSummary("");
    } else {
      webdavPwdPreference.setSummary("****");
    }
    
    getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);  
  }

  @Override
  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
    if (key.equals("webdav_url")) {
      webdavUrlPreference.setSummary(sharedPreferences.getString("webdav_url", ""));
    } else if (key.equals("webdav_user")) {
      webdavUserPreference.setSummary(sharedPreferences.getString("webdav_user", ""));
    }
    else if (key.equals("webdav_password")) {
      if (sharedPreferences.getString("webdav_password", "").equals("")) {
        webdavPwdPreference.setSummary("");
      } else {
        webdavPwdPreference.setSummary("****");
      }
    }
  }

  /**
   * Shows the simplified settings UI if the device configuration if the
   * device configuration dictates that a simplified, single-pane UI should be
   * shown.
   */
  @SuppressWarnings("deprecation")
  private void setupSimplePreferencesScreen() {
    if (!isSimplePreferences(this)) {
      return;
    }

    // In the simplified UI, fragments are not used at all and we instead
    // use the older PreferenceActivity APIs.

    addPreferencesFromResource(R.xml.pref_general);
    // Add 'data and sync' preferences, and a corresponding header.
    PreferenceCategory fakeHeader = new PreferenceCategory(this);
    fakeHeader.setTitle(R.string.pref_header_autosync);
    getPreferenceScreen().addPreference(fakeHeader);
    addPreferencesFromResource(R.xml.pref_autosync);
  }

  /** {@inheritDoc} */
  @Override
  public boolean onIsMultiPane() {
    return isXLargeTablet(this) && !isSimplePreferences(this);
  }

  /**
   * Helper method to determine if the device has an extra-large screen. For
   * example, 10" tablets are extra-large.
   */
  private static boolean isXLargeTablet(Context context) {
    return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
  }

  /**
   * Determines whether the simplified settings UI should be shown. This is
   * true if this is forced via {@link #ALWAYS_SIMPLE_PREFS}, or the device
   * doesn't have newer APIs like {@link PreferenceFragment}, or the device
   * doesn't have an extra-large screen. In these cases, a single-pane
   * "simplified" settings UI should be shown.
   */
  private static boolean isSimplePreferences(Context context) {
    return ALWAYS_SIMPLE_PREFS || Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB || !isXLargeTablet(context);
  }

  /** {@inheritDoc} */
  @Override
  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
  public void onBuildHeaders(List<Header> target) {
    if (!isSimplePreferences(this)) {
      loadHeadersFromResource(R.xml.pref_headers, target);
    }
  }

  /**
   * This fragment shows notification preferences only. It is used when the
   * activity is showing a two-pane settings UI.
   */
  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
  public static class AutoSyncPreferenceFragment extends PreferenceFragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      addPreferencesFromResource(R.xml.pref_autosync);
    }
  }

}

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